There’s very little evidence (I.e. non-biased scientific studies) showing that unionization has a positive impact on job performance, and there’s quite a bit of evidence that unionization has a negative impact on job performance. Though admittedly, most of the studies that are out there focus on the private sector rather than the public sector.

There is lots of evidence however that unions increase pay and improve working conditions.

So if your concern is that school principals are underpaid and have poor working conditions, then unionization is likely to help that - but only at the expense of an already-tight RPS budget.

If your concern is that RPS principals aren’t doing as good a job as they should be, then unionization is likely a step in the wrong direction.